Also in the LRB, John Lanchester:
In trying to think what Marx would have made of the world today, we have to begin by stressing that he was not an empiricist. He didn’t think that you could gain access to the truth by gleaning bits of data from experience, ‘data points’ as scientists call them, and then assembling a picture of reality from the fragments you’ve accumulated. Since this is what most of us think we’re doing most of the time it marks a fundamental break between Marx and what we call common sense, a notion that was greatly disliked by Marx, who saw it as the way a particular political and class order turns its construction of reality into an apparently neutral set of ideas which are then taken as givens of the natural order. Empiricism, because it takes its evidence from the existing order of things, is inherently prone to accepting as realities things that are merely evidence of underlying biases and ideological pressures. Empiricism, for Marx, will always confirm the status quo. He would have particularly disliked the modern tendency to argue from ‘facts’, as if those facts were neutral chunks of reality, free of the watermarks of history and interpretation and ideological bias and of the circumstances of their own production.
I, on the other hand, am an empiricist. That’s not so much because I think Marx was wrong about the distorting effect of underlying ideological pressures; it’s because I don’t think it’s possible to have a vantage point free of those pressures, so you have a duty to do the best with what you can see, and especially not to shirk from looking at data which are uncomfortable and/or contradictory. But this is a profound difference between Marx and my way of talking about Marx, which he would have regarded as being philosophically and politically entirely invalid.